12226e4371
and passed as paramters into straight forward non const built in types, i.e. const bool foogbar(const int) becomes bool foobar(int).
83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_ALPHAFUNC
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#define OSG_ALPHAFUNC 1
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#include <osg/StateAttribute>
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namespace osg {
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/** Encapsulate OpenGL glAlphaFunc.
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*/
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class SG_EXPORT AlphaFunc : public StateAttribute
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{
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public :
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AlphaFunc();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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AlphaFunc(const AlphaFunc& af,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(af,copyop),
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_comparisonFunc(af._comparisonFunc),
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_referenceValue(af._referenceValue) {}
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META_StateAttribute(osg, AlphaFunc,ALPHAFUNC);
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/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
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virtual int compare(const StateAttribute& sa) const
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{
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// check the types are equal and then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macro's below.
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COMPARE_StateAttribute_Types(AlphaFunc,sa)
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// compare each paramter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_comparisonFunc)
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COMPARE_StateAttribute_Parameter(_referenceValue)
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return 0; // passed all the above comparison macro's, must be equal.
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}
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virtual void getAssociatedModes(std::vector<GLMode>& modes) const
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{
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modes.push_back(GL_ALPHA_TEST);
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}
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enum ComparisonFunction {
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NEVER = GL_NEVER,
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LESS = GL_LESS,
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EQUAL = GL_EQUAL,
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LEQUAL = GL_LEQUAL,
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GREATER = GL_GREATER,
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NOTEQUAL = GL_NOTEQUAL,
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GEQUAL = GL_GEQUAL,
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ALWAYS = GL_ALWAYS
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};
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inline void setFunction(const ComparisonFunction func,float ref)
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{
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_comparisonFunc = func;
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_referenceValue = ref;
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}
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inline const ComparisonFunction getFunction() const { return _comparisonFunc; }
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inline float getReferenceValue() const { return _referenceValue; }
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virtual void apply(State& state) const;
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protected:
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virtual ~AlphaFunc();
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ComparisonFunction _comparisonFunc;
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float _referenceValue;
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};
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}
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#endif
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